@timstreater: "Thinking about ways to reduce the massive syphon effect up the chimbley 
when there's a howling gale outside, I thought of one of those stack 
pipes that bends over to vent horizontally, but can rotate and has a 
vane so it always points downwind.
After some googling it appears these are called "lobster back cowls".
Anyone ever used one of these and are they effective? I can use a 
balloon in the unused chimney but would like to reduce the gale effect 
for the one that's in frequent use.
Tim
"That excessive bail ought not to be required, nor excessive fines imposed,
nor cruel and unusual punishments inflicted"    Bill of Rights 1689"
    @tim: "In message 
<email_address>, 
"<email_address>" <email_address> writes
<quote>
I made a damper for our open fire.
Bit of a struggle securing the frame inside the chimney. Hinged flap, 
raised by a bit of picture chain fed through a tube in the chimney 
breast.
Soot has not been a problem, so far.
regards
Tim Lamb"
    @timstreater: "<email_address>,
<quote>
You mean, as in a damper or chimney balloon? The folks who put the 
fireplace in (before we owned the house) seemed to think a damper was 
not possible (it's a open fire).
The winds are variable and can be quite strong - from N, E, and W so far 
this winter. We're getting double-glazing next week and cavity wall 
insulation in a few weeks, I was hoping to avoid having all the good 
from that negated by the heat being syphoned up the chimney.
I'll take a look at the H cowl - thanks.
Tim
"That excessive bail ought not to be required, nor excessive fines imposed,
nor cruel and unusual punishments inflicted"    Bill of Rights 1689"
    @ericp: "On Fri, 02 Apr 2010 11:58:24 +0100, Tim Streater
<quote>
Those things are designed to improve the flow of air. So putting one
up will increase the gale to a hurricane."
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